Al Qaeda Leader Zawahiri Says He Has American Hostage

In a newly released audio message, al Qaeda leader Ayman al-Zawahiri claims that his organization is holding hostage Warren Weinstein, a 70-year-old American who went missing in August in Pakistan.

Zawahiri's statement is the first official claim of responsibility by any group in relation to the kidnapping, and a U.S. official said the statement buttressed earlier "indications" that al Qaeda might be holding the American.

"I tell the captive soldiers of Al Qaeda and the Taliban and our female prisoners held in the prisons of the crusaders and their collaborators, we have not forgotten you and in order to free you we have taken hostage the Jewish American Warren Weinstein," says Zawahiri in the 30-minute statement, which appeared on jihadi websites Thursday and otherwise focuses mainly on the situation in his native Egypt.

The leader of Al Qaeda addresses Weinstein's family, telling them that "your government tortures our prisoners, but we have not tortured your prisoner." He also warns them not to trust President Obama's assurances that everything is being done to secure Weinstein's release, accusing the president of wishing "[Weinstein] would be killed to get rid of his problem."

A U.S. official told ABC News that although there has been no "proof of life" offered by al Qaeda or its allies that proves they have Weinstein, there were already "indications" he may be held by al Qaeda.

"The documents from bin Laden's hideout show his frustrated deputies were considering kidnapping and other criminal enterprises as a means of striking for their weakened state," said the official. Zawahiri assumed the leadership of al Qaeda after Osama bin Laden was killed in a U.S. strike on his Pakistan hideout in May.

"It's entirely possible that al Qaeda or one of its militant allies may be holding Mr. Weinstein," said the official, "and the statement by Zawahiri supports this conclusion. The U.S. government is following every lead to help find Mr. Weinstein."